module Ecoportal
  module API
    class V1
      class PersonDetails < Common::BaseModel
        passthrough :schema_id

        class_resolver :schema_field_value_class, "Ecoportal::API::V1::SchemaFieldValue"

        def as_json
          super.merge "fields" => fields.map(&:as_json)
        end

        # Sets the `id` of the PersonDetails.
        # @note unless the new `id` is `nil`, this does not reset the `fields`.
        # @param value [nil, String] the id of the schema.
        def schema_id=(value)
          @fields          = [] if value.nil?
          doc["schema_id"] = value
        end

        # Gets all the fields of the PersonDetails.
        # @return [Array<SchemaFieldValue>] the array of fields of the schema.
        def fields
          return @fields if defined?(@fields)
          @fields = (doc["fields"] || []).map do |field|
            schema_field_value_class.new(field)
          end
        end

        # Gets one specific field of the PersonDetails.
        # @param id [String] the `id` or the `alt_id` of the target field.
        # @return [nil, SchemaFieldValue] the field or `nil` if missing.
        def get_field(id)
          @fields_by_id or index_fields
          @fields_by_id[id] || @fields_by_alt_id[id]
        end

        # Gets the value of one specific field of the PersonDetails.
        # @param id [String] the `id` or the `alt_id` of the target field.
        # @return [String, Array<String>, Boolean, Array<Boolean>, Date, Array<Date>, Numberic, Array<Numeric>] the value of field or `nil` if missing.
        def [](id)
          get_field(id)&.value
        end

        # Sets the value to one specific field of the PersonDetails.
        # @param id [String] the `id` or the `alt_id` of the target field.
        # @return [void]
        def []=(id, value)
          if field = get_field(id)
            field.value = value
          else
            raise "details[#{id.inspect}] is missing. Did you forget to load the schema?"
          end
        end

        protected

        # Rebuilds the internal `id` and `alt_id` references to the fields.
        def index_fields
          @fields_by_id     = {}
          @fields_by_alt_id = {}
          fields.each do |wrapped|
            @fields_by_id[wrapped.id] = wrapped
            @fields_by_alt_id[wrapped.alt_id] = wrapped
          end
        end

      end
    end
  end
end